Torga, Miguel
Rua Cintura do Porto, 2003
Buku Referensi
Hill, W.G
Scoop Boks LTD, 1991
Buku Teks SO
Office of the Secretary of State for Information and Tourism, [date of publication not identified]
Buku Teks SO
Malaysia. Kuala Lumpur Tourism Association
Kuala Lumpur Tourism Association, 2010
Buku Referensi
Mattoso, Jose
Editorial Caminho, 2003
Buku Teks